Magnetic heat generation

ABSTRACT

A magnetic heater is provided having a conductor assembly and a magnet assembly. The magnet assembly is adapted to rotate relative to the conductor assembly about an axis so as to induce eddy currents in the conductor assembly when relative motion is produced between the conductor assembly and first magnet assembly. The conductor assembly defines a fluid path therein for the transfer of heat from the conductor assembly to a fluid. The magnetic heater is a component of a heat generation system comprising an internal combustion engine having a drive shaft for rotating the magnet assembly. The heat generated by the magnetic heater, as well as the heat generated by the engine from the engine exhaust and engine cooling system, is combined to heat a fluid.

CROSS-REFERENCE TO RELATED APPLICATIONS

This is a divisional application and claiming benefit under 35 USC § 120to U.S. Utility application Ser. No. 11/174,316, filed Jun. 30, 2005 andentitled MAGNETIC HEAT GENERATION, which is in its entirety incorporatedherewith by reference; which is a continuation-in-part and claimingbenefit to application U.S. Utility application Ser. No. 10/821,295,filed Apr. 9, 2004 and entitled CONTROLLED MAGNETIC HEAT GENERATION,which is in its entirety incorporated herewith by reference, which is acontinuation-in-part application and claiming benefit to U.S. Utilityapplication Ser. No. 10/269,690, filed Oct. 11, 2002 and entitledMAGNETIC HEATER APPARATUS AND METHOD, which is in its entiretyincorporated herewith by reference; which is a continuation of andclaiming priority to application No. PCT/US02/23569, filed on Jul. 23,2002, which is in its entirety incorporated herewith by reference; whichis a non-provisional patent application claiming priority to U.S.Provisional application No. 60/307,409, filed on Jul. 24, 2001, which isin its entirety incorporated herewith by reference.

FIELD OF THE INVENTION

The present invention is related to devices for the production of heat,and more particularly, to methods and apparatus for generating heatusing magnetic induction.

BACKGROUND

A magnetic heater generates heat by a phenomenon known as magneticinductive heating. Magnetic inductive heating occurs in an electricallyconductive member when exposed to a time-varying magnetic field. Thevarying magnetic field induces eddy currents within the conductivemember, thereby heating it. An increase in the magnitude of thevariations of the magnetic field increases the rate at which theconductive member is heated. The heated conductive member can then beused as a heat source for various purposes. The heated conductive memberis often used to heat a fluid, such as air or water, which is circulatedpast the conductive member. The heated fluid is then used to transferthe heat from the heater for external use.

One method of exposing a conductive member to a varying magnetic fieldis to move a magnetic field source relative to the conductive member.This motion may be achieved by arranging magnets around the edge of acircular disk having a rotatable shaft substantially at its center, theflat surface of the disk being opposable to an essentially flat portionof the surface of the conductive member. As the shaft of the disk isrotated, the magnets move relative to the surface of the conductivemember. A given point on the conductive member is exposed to acyclically varying magnetic field as each of the magnets approach, passover, and retreat from that given point.

The amount of heat induced within the conductive member depends on manyfactors, some of which include the strength of the magnetic field, thedistance between the magnets and the conductive member (referred hereinas the “conductor/magnet spacing”), and the relative speed of themagnets to the conductive member.

Conventional magnetic heaters suffer from several disadvantages. Forexample, many conventional magnetic heaters have limited precision intheir control of operational parameters such as the rate of heatgeneration, the efficiency of heat generation, and the efficiency ofheat transfer to the working fluid used to carry the heat.

A magnetic heater is needed that provides one or more of the following:improved control of the rate of heat generation, improved efficiency ofheat generation, and improved efficiency of heat transfer to the workingfluid used to carry the heat.

SUMMARY

In an embodiment in accordance with the present invention, a magneticheater comprises a drive shaft, one or more conductor assemblies, andone or more magnet assemblies comprising one or more magnets. Eachconductor assembly comprises a pair of conductor plates defining a fluidspace there between. The fluid space is in fluid communication with afluid inlet and a fluid outlet adapted to allow the flow of fluidthrough the fluid space. At least one of the conductor plates comprisesan electrically conductive material adapted to enable inducededdy-currents within the at least one conductor plate when exposed to atime-varying magnetic flux. Each magnet assembly is in opposing, facingarrangement spaced apart a predetermined distance from a respectiveconductor assembly, aligned along an axis about the drive shaft. Themagnet assembly is adapted to dispose the one or more magnets in closeproximity to the conductor assembly. Each magnet assembly is coupled tothe drive shaft adapted such that the magnet assembly rotates relativeto the conductor assembly when the drive shaft is caused to rotate. Themagnet assembly is adapted to induce eddy currents in the conductorassembly when moved relative thereto. The fluid passage is adapted toprovide heat transfer from the conductor plates to the fluid as theconductor plates are heated during operation.

In another embodiment in accordance with the present invention, themagnetic heater further comprises wherein adjacent magnets have oppositepolarity.

In another embodiment in accordance with the present invention, themagnetic heater further comprises a first and second conductor assemblycoaxially disposed in alternating arrangement with a first, second, andthird magnet assembly.

In another embodiment in accordance with the present invention, themagnetic heater further comprises a magnet plate in the form of asubstantially circular disk. A plurality of magnet pockets disposed on aside of the magnet plate and at a predetermined distance adjacent amagnet plate peripheral edge, the plurality of magnet pockets adapted toat least partially receive at least one magnet therein, at least onemagnet at least partially disposed within each magnet pocket, and atleast one retainer plate coupled to the magnet plate coupling the magnetwithin the magnet pocket.

In another embodiment in accordance with the present invention, themagnetic heater wherein the retainer plates comprise a plurality offastener apertures adapted to receive suitable fasteners there through,the fastener apertures adapted to align with threaded bores disposed inthe magnet plate.

In another embodiment in accordance with the present invention, themagnetic heater wherein the retainer plate comprises a plurality ofretainer pockets complementary with the magnet pockets and adapted toreceive at least a portion of at least one magnet therein.

In another embodiment in accordance with the present invention, themagnetic heater wherein the magnet pockets are adapted to receive themagnet entirely therein, and the retainer plate comprises asubstantially flat surface to contain the magnet there in.

In another embodiment in accordance with the present invention, themagnetic heater wherein the magnet assembly comprises a magnet plate inthe form of a substantially circular disk, and at least one retainerplate coupled to the magnet plate, the at least one retainer plateincluding one or more magnet pockets disposed on a side of the retainerplate, the retainer pocket adapted to receive the magnet therein, atleast one magnet disposed within each magnet pocket.

In another embodiment in accordance with the present invention, themagnetic heater wherein the magnet plates further comprise a centralshaft aperture adapted to accept the drive shaft there through.

In another embodiment in accordance with the present invention, themagnetic heater wherein the pair of conductor plates are retained abouta peripheral edge in fluid-tight engagement. The conductor plates eachhave a bushing aperture adapted to receive the bushing therein. Abushing seal about the bushing aperture is adapted to engage theconductor plates in fluid-tight engagement there between to retain fluidwithin the fluid space.

In another embodiment in accordance with the present invention, themagnetic heater wherein the pair of conductor plates retained about aperipheral edge in fluid-tight engagement by a frame. The frame isadapted to retain the conductor plates in facing spaced-apartrelationship a predetermined distance apart defining a fluid space therebetween. The frame is adapted to seal the peripheral edge of theconductive plates such that fluid is retained within the fluid space,the conductor plates each have a bushing aperture adapted to receive thebushing therein, a bushing seal about the bushing aperture adapted toengage the conductor plates about the bushing aperture and the bushingis adapted to maintain fluid-tight engagement there between to retainfluid within the fluid space.

In an embodiment in accordance with the present invention, anengine-driven heat generation system comprises an internal combustionengine having a drive shaft, a magnetic heater, and a fluid handlingsystem. The magnetic heater comprises at least one conductor assemblyand at least one magnet assembly in closely-spaced, opposing,alternating configuration with the conductor assemblies, aligned alongan axis about the drive shaft. Each magnet assembly is coupled to thedrive shaft adapted such that the magnet assembly rotates relative tothe conductor assemblies when the drive shaft is rotated. The magnetassembly is adapted to induce eddy currents in the conductor assemblywhen moved relative thereto. The fluid handling system comprises a fluidreservoir, a manifold flow control adapted to direct fluid to the fluidpath of the magnetic heater, an exhaust heat exchanger, and a coolantheat exchanger. The heat from the exhaust of the engine is transferredto the fluid in the exhaust heat exchanger. The heat from an enginecooling system, which comprises a coolant reservoir, is transferred tothe fluid in the coolant heat exchanger. The heat generated by themagnetic heater is transferred to the fluid passing within the magneticheater. The fluid is recollected in the fluid reservoir and eitherdirected again through the manifold flow control or directed to anexternal heat exchanger by way of an external manifold. The externalmanifold is adapted to provide fluid take-offs to supply heated fluidand return cooled fluid to/from the external heat exchanger. The driveshaft of the engine adapted to rotate the magnet assemblies within themagnetic heater which in turn heats the conductor plates and a workingfluid flowing within the fluid path of the conductor assemblies, thefluid handling system.

In another embodiment in accordance with the present invention, anengine-driven heat generation system wherein the magnet assemblycomprises a plurality of magnets. The magnet assembly is adapted todispose the magnets in close proximity to the conductor assembly.

In another embodiment in accordance with the present invention, anengine-driven heat generation system wherein the magnetic heatercomprises a first, second and third conductor assembly in alternatingarrangement with a first, second, third, and fourth magnet assembly. Theconductor assemblies and magnet assemblies being disposed upon theshaft. The conductor assemblies and magnet assemblies are spaced apart apredetermined distance.

In another embodiment in accordance with the present invention, anengine-driven heat generation system wherein the magnet assemblycomprises a magnet plate in the form of a substantially circular disk, aplurality of magnet pockets disposed on a side of the magnet plate andat a predetermined distance adjacent a magnet plate peripheral edge, theplurality of magnet pockets adapted to at least partially receive atleast one magnet therein. At least one magnet at least partiallydisposed within each magnet pocket. At least one retainer plate coupledto the magnet plate capturing the magnet within the magnet pocket.

In another embodiment in accordance with the present invention, anengine-driven heat generation system wherein the retainer platescomprise a plurality of fastener apertures adapted to receive suitablefasteners there through, the fastener apertures adapted to align withthreaded bores disposed in the magnet plate.

In another embodiment in accordance with the present invention, anengine-driven heat generation system wherein the retainer platecomprises a plurality of retainer pockets complementary with the magnetpockets and adapted to receive at least a portion of at least one magnettherein.

In another embodiment in accordance with the present invention, anengine-driven heat generation system wherein the magnet pockets areadapted to receive the magnet entirely therein, and the retainer platecomprises a substantially flat surface to contain the magnet there in.

In another embodiment in accordance with the present invention, anengine-driven heat generation system wherein the retainer pockets areadapted to receive the magnet entirely therein, and the magnet platecomprises a substantially flat surface to contain the magnet there in.

In another embodiment in accordance with the present invention, anengine-driven heat generation system wherein the magnet plates furthercomprise a central shaft aperture adapted to accept the shaft therethrough.

In another embodiment in accordance with the present invention, anengine-driven heat generation system wherein the conductor assemblycomprises a pair of conductor plates retained about a peripheral edge influid-tight engagement by a frame. The conductor plates comprise anelectrically conductive material adapted to enable induced eddy-currentswithin the conductor plate when exposed to a time-varying magnetic flux.The frame is adapted to retain the conductor plates in facingspaced-apart relationship a predetermined distance apart defining afluid space there between. The frame is adapted to seal the peripheraledge of the conductive plates such that fluid is retained within thefluid space. The conductor plates each have a bushing aperture adaptedto receive the bushing therein. A bushing seal about the bushingaperture is adapted to engage the conductor plates about the bushingaperture and the bushing is adapted to maintain fluid-tight engagementthere between to retain fluid within the fluid space.

In another embodiment in accordance with the present invention, anengine-driven heat generation system wherein the conductor assemblyfurther comprising a fluid inlet and a fluid outlet, the conductorassembly adapted to provide a fluid passage within the fluid space. Thefluid space is adapted such that fluid may be passed between the fluidinlet and the fluid outlet sufficient to provide heat transfer from theconductor plates to the fluid as the conductor plates are heated duringoperation.

In an embodiment in accordance with the present invention, a magneticheater assembly comprises a blower including a motor, a blower housing,and a blower fan, and a magnetic heater including a magnet assembly. Theblower housing defines an annular volume in fluid communication with anaxial inlet and a tangential outlet. The blower fan includes a pluralityof fan blades coupled to a conductive member. The magnet assemblycomprises an axial shaft annulus. The magnet assembly is coaxiallylocated within the annular volume. The blower fan is coaxially locatedwithin the annular volume such that the conductive member of the blowerfan is located co-axially and adjacent the magnet assembly. The motor iscoupled to the blower housing such that a shaft of the motor is locatedcoaxially with the magnet assembly and the blower fan extending into theannular volume. The shaft extends into the annular volume, passingthrough the shaft annulus of the magnet assembly, and coupled inoperative engagement to the conductive member so as to rotate theconductive member when in operation, the magnet assembly coupled to andfixed the blower housing.

In another embodiment in accordance with the present invention, amagnetic heater wherein the fan blades are adapted to act as heat sinksfor the transfer of heat from the conductive member to the air.

The above embodiments are provided by way of example and in no way is tobe limiting the scope of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

Like reference numbers generally indicate corresponding elements in thefigures.

FIG. 1 is a side view of an embodiment of a magnetic heater, inaccordance with the present invention;

FIG. 2 is a front view of the magnet assembly of FIG. 1;

FIG. 3 is a side view of a magnetic heater, in accordance with anembodiment of the present invention;

FIG. 4 is a front view of a conductive member comprising a plurality ofseparate conductors, in accordance with an embodiment of the presentinvention;

FIG. 5 is a portion of the frame with a cross-sectional view of a magnetand a protective layer provided on the exterior of the magnet, inaccordance with an embodiment of the present invention;

FIG. 6 is a side view of an embodiment of a magnetic heater, inaccordance with the present invention;

FIG. 7 is a side view of a magnetic heater, in accordance with anembodiment of the present invention;

FIG. 8 is a front view of the embodiment of FIG. 7;

FIGS. 9A and 9B are side views of the magnetic heater comprising aspacing actuator for varying the conductor/magnet spacing, in accordancewith an embodiment of the present invention;

FIG. 10 is a side view of a radially moving magnet relative to aconductive member, in accordance with an embodiment of the presentinvention;

FIG. 11 is a partial view of the embodiment of FIG. 10, whereindifferent polarities of opposing magnets face the conductive member, inaccordance with an embodiment of the present invention;

FIG. 12 is a multi-stage magnetic heater, in accordance with anembodiment of the present invention;

FIG. 13A is a perspective view of a magnetic heater apparatus, inaccordance with an embodiment of the present invention;

FIG. 13B is an exploded view of the magnetic heater apparatus of FIG.13A.

FIG. 14A is a perspective exploded view of a magnetic heater apparatus,in accordance with another embodiment of the present invention;

FIG. 14B is a side cross-sectional view of the magnetic heater apparatusof FIG. 14A;

FIG. 15 is a front view of a magnetic heater, in accordance with anembodiment of the present invention;

FIG. 16 is a side cross-sectional view of the magnetic heater of FIG. 15along cut line 16-16;

FIG. 17 is a partial cutaway detailed view of the side cross-sectionalview of FIG. 16;

FIG. 18 is a partially exploded view of the magnetic heater of FIG. 15;

FIG. 19 is an exploded perspective view of a rotatable magnet assemblyof the magnetic heater of FIG. 15;

FIG. 20 is an exploded perspective view of a conductor assembly of themagnetic heater of FIG. 15;

FIG. 21 is a schematic diagram of an engine-driven heat generationsystem, in accordance with an embodiment of the present invention; and

FIG. 22 is a schematic diagram of an engine-driven heat generationsystem, in accordance with an embodiment of the present invention.

DETAILED DESCRIPTION

FIG. 1 is a side view of an embodiment of a magnetic heater 2 inaccordance with the present invention. The magnetic heater 2 comprises amagnet assembly 20 and a conductive member 14 disposed proximate themagnet assembly 20. Rotation of the magnet assembly 20 about an x-axisinduces a predetermined cyclical variation of magnetic field within theconductive member 14.

FIG. 2 is a front view of the magnet assembly 20 of FIG. 1. The magnetassembly 20 comprises a disk-shaped frame 22, a plurality of magnets 12,and a shaft 18. The plurality of magnets 12 are coupled to and arrangedin a planar, generally circular, spaced-apart, orientation on the frame22. The magnets 12 each have a first magnet surface 13 in asubstantially planar relationship, referred herein as the first magnetplane 21, shown in FIG. 1. The shaft 18 is coupled substantially at thecenter of rotation of the frame 22. The center of rotation of the frame22 defines the x-axis which is substantially perpendicular to the firstmagnet plane 21. The shaft 18 is adapted to couple with an energy sourcecapable of imparting rotation to the shaft 18.

The conductive member 14 has a planar conductive member first side 15 inopposing, substantially parallel relationship with the first magnetplane 21. The conductive member first side 15 and the first magneticplane 21 are spaced-apart a predetermined distance in opposingrelationship referred herein as a conductor/magnet spacing X1. Theconductive member 14 comprises an electrically-conductive material.

As the shaft 18 of the frame 22 is rotated, the magnets 12 move relativeto the conductive member first side 15 of the conductive member 14. Agiven point on the conductive member 14 will; therefore, be exposed to acyclically varying magnetic field as each of the magnets 12 approach,pass over, and retreat from adjacent that given point. The given pointon the conductive member 14 will thus be heated as long as the givenpoint is exposed to the time-varying magnetic field.

It is appreciated that the magnet assembly 20 can comprise one or moremagnets 12. One magnet 12 is sufficient to expose a cyclically varyingmagnetic field onto the conductive member 14. Therefore, it isappreciated that when reference is made to a plurality of magnets 12, itapplies also to embodiments comprising one magnet 12, and vice-versa.

In embodiments of the present invention, the magnets 12 are permanentmagnets. Therefore, the magnets 12 have a substantially constantmagnetic field strength. This is contrasted with an electromagnet, whichhas the capability of producing a range of magnetic field strengthdependent on varying the current driving the electromagnet. Therefore,the strength of the magnetic field produced by the permanent magnets 12that the conductive member 14 is exposed to primarily depends on theconductor/magnet spacing X1. The magnetic field strength of thepermanent magnet 12 is referred to as the absolute magnetic fieldstrength.

A fluid path 16 is defined such that heat transfer between theconductive member 14 and fluid moving within the fluid path 16 isenabled. Thus, as the conductive member 14 is heated, a fluid absorbs atleast a portion of the heat generated. The fluid can thus be used totransport the heat to another location.

The radial and axial placement of the magnets 12 about the frame 22 asshown in FIGS. 1 and 2 is exemplary only. Placement of the magnets 12about the frame 22 in other arrangements, orientations, spacing, amongother things, in planar relationship or otherwise, is anticipatedsuitable for a particular purpose of imparting a magnetic field onto theconductive member 14 and/or onto additional conductive members 14.Furthermore, the magnets 12 need not be of the same size, shape, polarorientation, composition, or type, among other things.

In the embodiment of FIGS. 1 and 2, the magnets 12 are oriented suchthat the conductive member 14 is exposed to an alternating polarity fromadjacent magnets 12, with their north poles N either pointing towards oraway from the conductive member 14. Such an arrangement produces arelatively large range of variation in the magnetic field on theconductive member 14 as compared with, for example, wherein all of themagnets 12 present the same polarity to the conductive member 14.

Relative motion between the conductive member 14 and the magnets 12 isproduced, wherein the magnets 12, are caused to rotate about the x-axisand holding the conductive member 14 stationary.

FIG. 3 is a side cross-sectional view of a magnetic heater 3 wherein theconductive member 14 is caused to rotate about the x-axis and holdingthe magnet assembly 20, and thus, the magnets 12, stationary. Theconductive member 14 is coupled to a shaft 18 that is coupled to anenergy source suitable for rotating the shaft 18 about the x-axis.

It is understood that relative motion between the magnets 12 and theconductive member 14 can be produced, in accordance with embodiments ofthe present invention, by the above mentioned configurations, and byother configurations, such as, but not limited to, rotation of both themagnet assembly 20 and conductive member 14 at different rates in thesame direction, and rotation of both the magnet assembly 20 andconductive member 14 in opposite directions.

The absolute magnetic field strength of the magnet 12 is a measure ofthe magnitude of the magnetic field generated by the magnet 12 at apoint on the magnet 12. For permanent magnets, the absolute magneticfield strength is essentially fixed. For electromagnets, the absolutemagnetic field strength depends on the amount of current passing throughthe magnets coils.

The magnetic field exerted on the conductive member 14 depends on, amongother things, the absolute magnetic field strength of the magnet 12 andthe conductor/magnet spacing X1 between the magnet 12 and the conductivemember 14.

A variety of magnets 12 are suitable for embodiments of the presentinvention. Permanent magnets 12 are advantageous for certainembodiments, for at least the reason that it is not necessary to supplyelectrical power to the magnets 12, hence no wiring or power source isneeded for such purpose.

The rate of heat generation in a magnetic heater 2, 3 in accordance withembodiments of the present invention depends in part on the absolutemagnetic field strength of the magnets 12. Therefore, for applicationswherein a high rate of heat generation is desirable, it is alsodesirable that the magnets 12 have a relatively high absolute magneticfield strength.

In addition, the maximum temperature that can be generated by a magneticheater 2, 3 according to embodiments of the present invention depends inpart on the heat tolerance of the magnets 12. Permanent magnets have a“maximum effective operating temperature” above which their magneticfield begins to degrade significantly.

Electromagnets likewise suffer from decreased performance withincreasing temperature, though the decrease is not as well defined asthat of permanent magnets. For example, the resistance of the magneticfield coils in an electromagnet gradually increases with increasingtemperature, which in turn gradually reduces the current flow at a givenvoltage, generating still more heat. Magnets of both types are availablesuitable for use at elevated temperatures.

Permanent magnets known as rare earth magnets, such as, but not limitedto Samarium Cobalt magnets, have a relatively high absolute magneticfield strength and operating temperature, and are suitable for theparticular purpose.

The conductive member 14 comprises an electrically conductive materialsuitable for the particular purpose. Suitable materials include, but arenot limited to, copper, aluminum, alloys of copper, alloys of aluminum,and other metallic or non-metallic, electrically conductive substances.The conductive member 14 is adapted to enable induced eddy-currentswithin the conductive member 14 when exposed to a time-varying magneticflux. The conductive member 14 of the embodiment of FIG. 1 is generallydisc-shaped. The conductive member 14 is not particularly limited to aspecific shape, size, or configuration. In other embodiments, theconductive member is formed in two or more pieces, as a thin conductivelayer on a non-conductive substrate, having defined apertures therein,among other configurations.

The conductive member need not consist of a closed loop or integralpiece of conductive material. FIG. 4 is a front view of a conductivemember assembly 11 comprising a plurality of separate conductors 27 thatare separated from one another by non-conductive material 48 inaccordance with an embodiment of the present invention. In such a case,each conductor 27 is heated independently.

Likewise, the conductive member 14, even if a single contiguous piece ofconductive material, might be shaped with apertures, or be constructedof wires, beams, rods, etc., with empty space therebetween.

FIGS. 1 through 3 show the magnetic heater 2, 3 in simplified schematicform for clarity. It is understood that additional structure may bepresent to provide structural support for containment and alignment.

FIG. 5 is a cross-sectional view of a portion of the magnet assembly 20comprising a frame 22 with a magnet 12 and a protective layer 31provided on the exterior of the magnet 12. The protective layer 31 isselected for a particular purpose, including, but not limited to,thermal protection, additional structural integrity, and chemicalprotection.

A variety of materials are suitable for use as the protective layer 31,so long as they do not significantly reduce the propagation of themagnetic field of the magnet 12.

In one embodiment, the protective layer 31 comprises aluminum. It isnoted that aluminum has a high reflectivity, thus inhibiting theabsorption of heat by the magnet 12, and a high infrared emissivity,thus facilitating the rapid re-radiation of heat away from the magnet12. These properties combine to provide passive cooling for the magnet12. In addition, aluminum is relatively durable, and so a protectivelayer 31 of aluminum serves to protect the magnet 12 physically.Likewise, aluminum is relatively impermeable, and thus may effectivelyseal the magnet 12 against any potential corrosive effects due tomoisture, oxygen, fluid flowing through the fluid path 16 (see below),among other things.

In addition, in other embodiments, the magnetic heater 2, 3 may includean additional active or passive cooling mechanism for the magnets 12. Awide variety of cooling mechanisms are suitable for the particularpurpose. For example, passive cooling mechanisms include, but are notlimited to, heat sinks and radiator fins. Active cooling mechanismsinclude, but are not limited to, coolant loops and refrigeration units.

It is noted that the fluid flow path 16, as described below, may beconfigured to act as a cooling mechanism. In some embodiments of thepresent invention, fluid is used to provide a mechanism for absorbingheat from the conductive member 14, and it is well suited for absorbingheat from the magnets 12 as well.

In other embodiments in accordance with the present invention, heat isgenerated for use via direct conduction or radiation from the conductivemember 14. For example, heat could be transferred from the conductivemember 14 to a solid heat conductor, heat sink, or heat storage device,such as, but not limited to, a mass of ceramic, brick, stone, etc.

FIG. 6 is a side cross-sectional view of the magnetic heater 2 whereinthe fluid path 16 is defined so that at least a portion thereof extendsbetween the magnets 12 of the magnet assembly 20 and the conductivemember 14 in accordance with embodiments of the present invention. Thefluid path 16 extends substantially parallel with the conductive member14 and the magnets 12, between the magnets 12 and the conductive member14.

Suitable fluids for the particular purpose include, but are not limitedto, gaseous fluids such as air and liquid fluids such as water. When theconductive member 14 is heated, fluid in the fluid path 16 receives heatfrom conductive member 14. Heat transfer from the conductive member 14to fluid in the fluid path 16 may occur via one or more of conduction,convection, and radiation.

FIGS. 7 and 8 are side and front views of an embodiment of the magneticheater 2 further comprising a fluid driver 34 engaged with a fluid path16 for driving fluid therethrough, in accordance with the presentinvention. The fluid driver 34 comprises a plurality of fins 35 orblades and a driver shaft 36. Examples of suitable fluid drivers 34include, but are not limited to, finned rotors, squirrel cages, andfans. In the embodiment of FIG. 7, the driver shaft 36 extends throughan aperture 37 in the conductive member 14 and is coupled to the frame22 on which the magnets 12 are arranged. The driving action is providedby rotation of the frame 22, which turns the fluid driver 34 in apredetermined direction. Thus, the speed of operation of the fluiddriver 34 therein depends on the speed of motion of the frame 22, andlikewise the rate of fluid flow within the fluid path 16. In otherembodiments, the driver shaft 36 is coupled to, among other things, theshaft 18 or an external energy source.

In an embodiment wherein the conductive member 14 rather than the frame22 moves to produce the cyclically varying magnetic field, the fluiddriver 34 is driven by the rotation of the conductive member 14.

It is appreciated that the temperature to which fluid passing throughthe fluid path 16 is heated depends on the rate of heat generation inthe conductive member 14, that is, on the amount of heat available towarm the fluid. Also, the temperature of the fluid depends on the rateat which the fluid moves through the fluid path 16, that is, on how muchfluid is available to absorb the heat that is generated. Further, thetemperature of the fluid depends on the efficiency of the conductivemember 14 is releasing its heat to the fluid.

Also because the parameters, including rate of heat generation, rate offluid flow, and fluid temperature, are independent of one another asdescribed in some embodiments herein, a magnetic heater 2 in accordancewith embodiments of the present invention is used to produce a specifictemperature of fluid in combination with a specific quantity of fluidflow. Any two of the three parameters can be controlled independently ofone another.

The energy source used to drive the shaft 18 can comprise any suitablemeans.

In embodiments in accordance with the present invention, the shaft 18 iscoupled with a power take-off found on some motor vehicles, such as, butnot limited to, many tractors, other agricultural vehicles, and heavywork vehicles. In such vehicles, some or all of the mechanical drivingforce generated by the engine is transferred to the power take-off toimpart rotation, such as to the shaft 18. Conventional power take-offsinclude a rotatable coupling or other movable component, which isengaged with a linkage to impart rotation to the shaft 18.

In other embodiments, the shaft 18 comprises a hydraulic linkage.Certain vehicles include hydraulic systems, such as, but not limited to,for actuating a snow plow or shovel blade, for tipping a truck bed, orfor operating a fork lift. The hydraulic system is adapted to couplewith a piece of supplemental equipment, such as a hydraulic motor, withsuitable linkage adapted to couple with the shaft 18, to provide powerthereto. Hydraulic systems and hydraulic linkages are known in the art,and are not described in detail herein.

Various embodiments are anticipated so as to control the rate of heatoutput of the magnetic heater 2.

FIGS. 9A and 9B are side cross-sectional views of the magnetic heater 2of FIG. 1, further comprising a spacing actuator 26 for varying theconductor/magnet spacing X1, in accordance with an embodiment of thepresent invention. The spacing actuator 26 varies the conductor/magnetspacing X1 between the conductive member first side 15 and the firstmagnet surface 13 along the x-axis.

The strength of the magnetic field exerted on a given portion of theconductive member 14 depends in part on the conductor/magnet spacing X1between the magnets 12 and the conductive member 14. A change in theconductor/magnet spacing X1 changes the magnetic field strength to whichthe conductive member 14 is exposed, and thus changes the range ofvariation of the magnetic field over a cycle (the cyclical variation ofthe magnetic field), which changes the rate at which heat is generatedin the conductive member 14. For permanent magnets, the cyclicalvariation of the magnetic field is accomplished while the absolutemagnitude of the magnetic field strength remains substantially constant.

Reducing the conductor/magnet spacing X1 increases the magnetic fieldstrength on the conductive member 14 and increases the magneticinduction, thus increasing the heating of the conductive member 14.Increasing the conductor/magnet spacing X1 reduces the magnetic fieldstrength on the conductive member 14 and reduces the magnetic induction,thus reducing the heating of the conductive member 14.

In embodiments wherein it is desirable to enable a relatively highmaximum rate of heat generation, it is desirable that a minimum value ofthe conductor/magnet spacing X1 between the conductive member 14 and themagnets 12 be as small as is practical. Similarly, in embodimentswherein it is desirable to enable a high range of variability in therate of heat generation, it is desirable that the range of possiblevalues for the conductor/magnet spacing X1 between the conductive member14 and the magnets 12 is relatively large.

The conductor/magnet spacing X1 is a parameter that is independent ofthe rate of motion of the magnets 12 with respect to the conductivemember 14, and thus independent of the rate of cyclical variation of themagnetic field. Thus, the rate of heat generation of the magnetic heater2 is adjustable by varying the conductor/magnet spacing X1 withoutchanging the period of cyclical variation of the magnet magnetic field.

Likewise, the conductor/magnet spacing X1 is independent of the absolutemagnetic field strength of the magnets 12. Thus, the rate of heatgeneration of the magnetic heater 2 is adjustable by varying theconductor/magnet spacing X1 without changing the absolute magnetic fieldstrength of the magnets 12. What is changing with varying theconductor/magnet spacing X1, among other things, is the magnitude of themagnetic field that the conductive member 14 is exposed to. The rate ofheat generation of the magnetic heater 2 is adjustable while it isgenerating heat by adjusting the conductor/magnet spacing X1.

The spacing actuator 26 is engaged with either the magnet assembly 20 orthe conductive member 14 so as to vary the conductor/magnet spacing X1therebetween. In other embodiments, the magnetic heater 2 comprisesseparate spacing actuators 26 engaged with the magnet assembly 20 andthe conductive member 14. Such arrangements facilitate adjustment of theconductor/magnet spacing X1, and consequently facilitates adjustment ofthe rate of heat generation. In an embodiment in accordance with thepresent invention, the spacing actuator 26 is used to facilitateadjustment of the conductor/magnet spacing X1 while the magnetic heater2 is generating heat.

A variety of actuators are suitable for use as the spacing actuator 26.In one embodiment, as schematically illustrated in FIGS. 9A and 9B, thespacing actuator 26 is a simple linear actuator, engaged with theconductive member 14 to move it toward or away from the magnet assembly20, thereby adjusting the conductor/magnet spacing from X1 to X2.

In an embodiment in accordance with the present invention, the spacingactuator 26 is a manual actuator, such as, but not limited to, athreaded screw controlled by a hand-turned knob. In other embodiments,the spacing actuator 26 is a powered actuator, such as, but not limitedto, an electrically or hydraulically driven mechanism.

Referring again to FIG. 7, the magnetic heater 2 further comprises acontroller 38. The controller 38 is in communication with the spacingactuator 26, so as to control the conductor/magnet spacing X1. Thecontroller 38 also is in communication with the shaft 18, so as tocontrol the speed of motion of the magnet assembly 20, and therefore,the magnets 12, which derive their motion from the shaft 18, wherein theoutput of the motive device driving the shaft 18 is variable andcontrollable.

The fluid driver 34 is engaged with the magnet assembly 20 so that thespeed of operation of the fluid driver 34, and consequently the rate offluid flow along the fluid path 16, also is determined by the speed ofmotion of the magnet assembly 20.

The controller 38 in FIG. 7 thus controls the rate of heat generation bycontrolling the conductor/magnet spacing X1, and also controls the rateof fluid flow by controlling the rate at which the fluid driver 34operates. By controlling these two parameters independently, thetemperature of the fluid also can be controlled as described previously.

A variety of devices are suitable for use as a controller 38, including,but not limited to, integrated circuits. Controllers are known in theart, and are not described further herein.

Although the embodiment in FIG. 7 shows the controller 38 incommunication with various sensors 40, 42, it is emphasized that this isexemplary only. In other embodiments, the controller 38 controls theoperation of the magnetic heater 2 without sensors or data therefrom. Inembodiments in accordance with the present invention, the controller 38comprises stored data and/or a pre-calculated algorithm, based on, amongother things, the design of the magnetic heater 2 and the performance ofsimilar magnetic heaters 2. The controller 38 controls the magneticheater 2 to produce the desired levels of heat generation, fluidtemperature, and/or rate of fluid flow, without the need for activesensors to monitor the parameters of the magnetic heater 2 itself.

The embodiment in FIG. 7 includes a fluid temperature sensor 40, forsensing the temperature of fluid moving along the fluid path 16. It alsoincludes a fluid flow rate sensor 42, for sensing the rate of fluid flowthrough the fluid path 16. It further includes a drive sensor 44, forsensing the rate at which the magnet assembly 20 is driven by the shaft18. The controller 38 is in communication with each of the sensors 40,42, and 44.

Based on data from the sensors 40, 42, and 44, the controller 38 adjuststhe speed of the magnet assembly 20, the speed of the fluid driver 34,and/or the conductor/magnet spacing X1, so as to control heatgeneration, fluid temperature, and/or fluid flow.

It is emphasized that the arrangement of the sensors 40, 42, and 44 asshown is exemplary only. It is not necessary for a particular embodimentto include sensors at all, or to include each of the sensors 40, 42, and44 shown in FIG. 7. In other embodiments, other sensors are included inthe magnetic heater 2 in addition to or in place of those shown.

In an embodiment, the magnetic heater 2 comprises an additional sensoradapted to sense the conductor/magnet spacing X1 between the magnets 12and the conductive member 14.

A variety of sensors are suitable for use in a magnetic heater 2according to embodiments of the present invention, depending upon theparticulars of the specific embodiment of the magnetic heater 2 and thetype of information that is to be sensed. Sensors are known in the art,and are not described further herein.

FIG. 10 is a side cross-sectional view of a magnetic heater 4 inaccordance with an embodiment of the present invention. A conductivemember 14 comprises a conductive member first side 15 a and a conductivemember second side 15 b. A first magnet assembly 20 a comprising a firstframe 22 a and a plurality of first magnets 12 a thereon is disposed afirst spacing X3 away from the conductive member first side 15 a.Similarly, a second magnet assembly 20 b comprising a second frame 22 band a plurality of second magnets 12 b thereon is disposed a secondspacing X4 away from the conductive member second side 15 b of theconductive member 14.

The first and second magnet assemblies 20 a, 20 b are disposed adjacentthe conductive member first and second sides 15 a, 15 b, respectively,such that the magnets 12 a and 12 b, respectively, are aligned with oneanother to form opposing pairs on each side 15 a, 15 b of the conductivemember 14. In an embodiment wherein the first and second magnetassemblies 20 a, 20 b are movable, they are movable together orindependently so as to maintain in opposing magnets pairs.

FIG. 11 is a cross-sectional partial view of the embodiment of FIG. 10,wherein different polarities of opposing magnets 12 a, 12 b face theconductive member 14, to present a predetermined gradient in themagnetic field. In another embodiment (not shown), the same polarity ofopposing magnets 12 a, 12 b face the conductive member 14, to present apredetermined gradient in the magnetic field that is produced.

FIG. 12 is a side cross-sectional view of an embodiment of a multi-stagemagnetic heater 6, in accordance with the present invention. As with theembodiment shown in FIG. 1, the embodiment of FIG. 10 may beconveniently expanded by the use of additional conductive members 14 andmagnet assemblies 20. The embodiment of FIG. 1 12 comprises anarrangement with three conductive members 14 a-c and four magnetassemblies 20 a-d. It is noted that the number of conductive members 14and magnet assemblies 20 is exemplary only, and that other numbers andarrangements may be suitable for a particular purpose. A fluid driver 34is shown adjacent the conductive members 14 and magnet assemblies 20.

The multi-stage magnetic heater 6 further comprises support bracing 90coupling the plurality of magnet assemblies 20 a-d in relative axialalignment. It is appreciated that the operation of the magnetic heater 6is effective whether the magnet assemblies 14 a-d or the conductivemembers 14 a-c are driven to rotation by the shaft 18.

FIGS. 13A and 13B are assembled and exploded views, respectively, of amagnetic heater apparatus 8 in accordance with an embodiment of thepresent invention. The magnetic heater apparatus 8 comprises a rearhousing 94, a first end plate 91, a heater housing 92, a magnetic heater6, a second end plate 93, a blower housing 96, and an air intake screen97.

The magnetic heater 4, in accordance with the embodiment of FIG. 10,comprises a shaft 18, a first magnet assembly 20 a, a conductive member14, a second magnet assembly 20 b and a fluid driver 34. The first andsecond magnet assemblies 20 a, 20 b comprise a plurality of magnets 12.The conductive member 14 is disposed between and coaxial with the firstand second magnet assemblies 20 a, 20 b. The conductive member 14 iscoupled with the shaft 18 and adapted to rotate with respect to thefirst and second magnet assemblies 20 a, 20 b. The shaft 18 is adaptedto couple with an energy source 103.

The rear housing 94 is coupled adjacent the first end plate 91, bothcomprising apertures to allow the shaft 18 to pass there through. Thefirst end plate is coupled adjacent the heater housing 92 defining avolume adapted to contain the first and second magnet assemblies 20 a,20 b and conductive member 14. The second end plate 93 is coupledadjacent the heater housing 92 defining a side of the volume. The heaterhousing 92 comprises a fluid outlet 102. The second end plate 93comprises a second end plate aperture 95 defining a portion of a fluidpath. The fluid driver 34 is coupled to the shaft 18 and locatedadjacent the second end panel 93 on the opposite side from the secondmagnet assembly 20 b. The blower housing 96 is coupled adjacent thesecond end panel 93 enclosing the fluid driver 34 there between. Theblower housing 96 defines a fluid inlet aperture 87 defining a portionof the fluid path. The air intake screen 97 is coupled to the blowerhousing 96 covering the fluid inlet aperture 87.

A fluid path is defined by the fluid inlet aperture 87, the fluid driver34, the second end plate aperture 95, the heater housing 92 and thefluid outlet 102. Fluid is drawn into the fluid inlet aperture 87 by therotation of the fluid driver 34. The fluid driver 34 directs the fluidthrough the second end plate aperture 95 and circulates the fluid pastthe conductive member 14 in the heater housing 92. The heater housing 92directs the fluid to the fluid outlet 102.

The magnetic heater apparatus 8 further comprises a spacing adjustmentassembly 103 comprising a knob 99, a threaded spacer 105 having a firstspacer end 108 and a second spacer end 109, a first retention coupler107 and a second retention coupler 106. The first retention coupler 107is positioned adjacent the first magnet assembly 20 a and the secondretention coupler 109 is positioned adjacent the second magnet assembly20 b. The threaded spacer 105 is disposed between the first and secondmagnet assemblies 20 a, 20 b, the first spacer end 108 coupled with thefirst retention coupler 107. The second spacer end 109 is passed throughthe second retention coupler 106 and coupled to the knob 99. Turning theknob 99 in a first direction reduces the spacing between the first andsecond magnet assemblies 20 a, 20 b. Turning the knob 99 in the oppositedirection increases the spacing between the first and second magnetassemblies 20 a, 20 b.

FIGS. 14A and 14B are exploded and cross-sectional views, respectively,of a magnetic heater apparatus 7 in accordance with an embodiment of thepresent invention. The magnetic heater apparatus 7 comprises a blower199 and a magnetic heater 3. The blower 199 comprises a motor mount 191,a motor 103, a blower housing 196, blower fan 134, a blower housingsleeve 192, and an air intake screen 197. The magnetic heater 3comprises a magnet assembly 20 and a conductive member 14 that is anelement of the blower fan 134 as described below.

Those in the air-moving arts will recognize that the blower 199 issubstantially of the known squirrel-cage blower configuration. Theblower housing 196 defines an annular volume 195 in fluid communicationwith an axial inlet 193 and a tangential outlet 194.

The blower fan 134 comprises a plurality of fan blades 198 coupled tothe conductive member 14. The conductive member 14 is in the form of adisk-shaped plate of substantially the same configuration as theembodiment of FIG. 3. The magnet assembly 20 is also of substantiallythe same configuration as the embodiment of FIG. 3. The magnet assembly20 comprises an axial shaft annulus 23. The magnet assembly 20 iscoaxially located within the annular volume 195. The blower fan 134 iscoaxially located within the annular volume 195 such that the conductivemember 14 of the blower fan 134 is located co-axially and adjacentmagnet assembly 20. The blower housing sleeve 192 is coupled to theblower housing 196 about the axial inlet 193 located co-axially with andadjacent to the blower fan 134 and adapted to guide air flow from theaxial inlet 193 to the blower fan 134. The air intake screen 197 iscoupled to the blower housing 196 so as to cover the axial inlet 193.

It is anticipated that in other embodiments in accordance with thepresent invention, the blower housing sleeve 192 is an integral part ofthe blower housing 196 in consideration of engineering preference.

The motor mount 191 is coupled to the blower housing 196, and the motor103 is coupled to the motor mount 191 such that a shaft 18 of the motor103 is located coaxially with the magnet assembly 20 and the blower fan134 extending into the annular volume 195. The shaft 18 extends into theannular volume 195, passing through the shaft annulus 23 of the magnetassembly 20, and is coupled in operative engagement to the conductivemember 14, so as to rotate the conductive member 14, and thus the blowerfan 134, when in operation. The magnet assembly 20 is coupled to andfixed the blower housing 196. In operation, the conductive member 14 isrotated relative to the stationary magnet assembly 20, whereby theconductive member 14 is heated due to inductive heating from atime-varying magnetic flux induced by the magnet assembly 20.

It is anticipated that in other embodiments in accordance with thepresent invention, the motor 103 is mounted to the blower housing 196 inany suitable manner, in consideration of engineering preference.

In operation, air is drawn into the axial inlet 193, directed by theblower housing sleeve 192, by the blower fan 134. The air passes overthe conductive member 14 wherein the heat generated by the magneticheater 3 is transferred to the air. The heated air is subsequentlyexhausted out of the tangential outlet 194. In other embodiments inaccordance with the present invention, the fan blades 198 are adapted toact as heat sinks for the transfer of heat from the conductive member 14to the air.

FIG. 15 is a front view of a magnetic heater 9, in accordance with anembodiment of the present invention. FIG. 16 is a side cross-sectionalview of the magnetic heater of FIG. 15 along cut line 16-16. Themagnetic heater 9 comprises a plurality of conductor assemblies 50, 50a-b and a plurality of magnet assemblies 60, 60 a-c in closely-spaced,opposing, alternating configuration, aligned along an axis about a shaft18. Each of the plurality of magnet assemblies 60 are coupled to theshaft 18, such that the magnet assemblies 60 rotate relative to theconductor assemblies 50 when the shaft is rotated.

It is appreciated that in other embodiments, the magnetic heater 9 maycomprise one or more conductor assemblies 50 and one or more magnetassemblies 60 suitable for a particular purpose. By way of example, butnot limited thereto, a magnetic heater may have one conductor assembly50 and one magnet assembly 60; one conductor assembly 50 and two magnetassemblies 60, one magnet assembly 60 on either side of the conductorassembly 50; one magnet assembly 60 and two conductor assemblies 50, oneconductor assembly 50 on either side of the magnet assembly 60; andcombinations of the above. One can understand that heat output isrelated to the number of conductor assemblies 50 and magnet assemblies60 and that the magnetic heater provides a modular approach forproviding heat output.

FIG. 17 is a partial cutaway detailed view of the side cross-sectionalview of FIG. 16. The magnet assembly 60 comprises one or more magnets 12and is adapted to dispose the one or more magnets 12 in close proximityto the conductor assembly 50.

FIG. 18 is a partially exploded view of the magnetic heater 9 of FIGS.15-17. The magnetic heater 9 comprises a first, second and thirdconductor assembly 50 a-b in alternating arrangement with a first,second, third, and fourth magnet assembly 60 a-c. The conductorassemblies 50 a-b and magnet assemblies 60 a-c are disposed upon a shaft18, which itself is supported by a pair of pillow blocks 72. Theconductor assemblies 50 a-b and magnet assemblies 60 a-c are spacedapart a predetermined distance and held together as an assembly by aplurality of bushings 70, collars 71, and the pillow blocks 72. Themagnetic heater 9 is adapted such that the magnet assemblies 60 a-c arecoupled to the shaft 18 and rotate relative to the conductor assemblies50 a-b when the shaft 18 is rotated.

FIG. 19 is an exploded perspective view of a magnet assembly 60 of themagnetic heater 9 of FIG. 15. The magnet assembly 60 comprises a magnetplate 61 in the form of a substantially circular disk. Disposed on aside of the magnet plate 61 and a predetermined distance adjacent themagnet plate peripheral edge 69 are a plurality of magnet pockets 62adapted to at least partially receive at least one magnet 12 therein.The magnets 12 are retained within the magnet pockets 62 by a pluralityof retainer plates 63. The retainer plates 63 comprise a plurality offastener apertures 66 adapted to receive suitable fasteners 64 therethrough. The fastener apertures 66 are adapted to align with threadedbores 67 disposed in the magnet plate 61. The retainer plates 63 engagethe magnets 12 and the magnet plate 61 to retain the magnets 12 withinrespective magnet pockets 62.

Referring again to FIG. 17, the retainer plates 63 comprise a pluralityof retainer pockets 68 complementary with the magnet pockets 62 andadapted to receive at least one magnet 12 therein. In other embodiments,either the magnet pockets 62 or the retainer pockets 68 are adapted toreceive the magnet 12 entirely therein, and either the retainer plate 63or the magnet plate 61, respectively, comprise a substantially flatsurface to contain the magnet 12 there in.

The magnet plate 61 further comprise a central shaft aperture 65 adaptedto receive the shaft 18 there through.

It is appreciated that in other embodiments, the magnet assembly 60 maycomprise one or more magnets 12 suitable for a particular purpose. Themagnet 12 provides a time-varying magnetic flux on the conductorassembly 50 when there is relative movement of the magnet 12 withrespect to the conductor assembly 50. Such magnetic flux may be providedby one or more magnets 12. Further, the size and shape of the magnet 12can be chosen to provide a predetermined magnetic flux density suitablefor a particular purpose. In yet other embodiments in accordance withthe present invention, there is provided multiple rows of magnets 12spaced apart in the radial direction from the shaft aperture 65.

Further, it is appreciated that in other embodiments in accordance withthe present invention, the magnet assembly 60 may take other formssuitable for a particular purpose for providing the magnets 12 in closeproximity to the conductor assembly 50. The magnets 12 can be coupled tothe magnet plate by other fastening means, including, but not limitedto, fasteners, adhesives, and coatings, with or without the retainerplate 61. In embodiments wherein the magnet assembly 60 is rotated, themeans of retention of the magnets 12 to the magnet plate 61 mustwithstand the forces tending to decouple and throw the magnets 12 fromthe magnet plate 61.

FIG. 20 is an exploded perspective view of a conductor assembly 50 ofthe magnetic heater 9 of FIG. 15. The conductor assembly 50 comprises apair of conductor plates 52 a, 52 b retained about a peripheral edge 55in fluid-tight engagement by a frame 51. At least one of the pair ofconductor plates 52 a, 52 b comprises an electrically conductivematerial suitable for the particular purpose, adapted to enable inducededdy-currents within the conductor plate 52 a, 52 b when exposed to atime-varying magnetic flux which causes the conductor plate 52 a, 52 bto heat up.

The frame 51 is adapted to retain the conductor plates 52 a, 52 b in afacing relationship a predetermined distance apart defining a fluidspace 56 there between. A gasket 59 seals the peripheral edge 55 of theconductive plates 52 a, 52 b such that fluid is retained within thefluid space 56. It is appreciated that suitable means for fluid-tightsealing is provided, such as, but not limited to, welding, brazing,soldering, the frame 51, coatings, and resilient sealing elements, suchas, but not limited to, an “O-ring” and gasket.

The conductor plates 52 a, 52 b each have a bushing aperture 53 adaptedto receive the bushing 70 therein. A bushing aperture seal 54 about thebushing aperture 53 and adapted to engage the conductor plates 52 a, 52b about the bushing aperture 53 is adapted to maintain fluid-tightengagement there between to retain fluid within the fluid space 56.

Referring again to FIGS. 15 and 18, the conductor assembly 50 furthercomprises a fluid inlet 57 and a fluid outlet 58, in communication withthe fluid space 56. Referring to FIG. 20, the fluid inlet 57 and outlet58 are an element of one or both of the conductor plates 52 a, 52 b. Theconductor assembly 50 is adapted such that fluid may be passed betweenthe fluid inlet 57, the fluid space 56, and the fluid outlet 58sufficient to provide efficient heat transfer from the conductor plates52 a, 52 b to the fluid as the conductor plates 52 a, 52 b are heatedduring operation.

FIG. 21 is a schematic diagram of an engine-driven heat generationsystem 100, in accordance with an embodiment of the present invention.The engine-driven heat generation system 100 provides heat to externalapplications via a working fluid supplied to a suitable external heatexchanger 126 as described below. The engine-driven heat generationsystem 100 comprises an internal combustion engine 110, a magneticheater 9, such as, but not limited to, the embodiment of FIG. 18, and afluid handling system 130. A drive coupling of the engine 110 drives orrotates the magnet assemblies 60 within the magnetic heater 9 which inturn heats the conductor plates 52 a, 52 b and the working fluid flowingwithin the conductor assemblies 50.

The fluid handling system 130 comprises a working fluid handling system120, an engine cooling system 112, and an exhaust system 129. Theworking fluid handling system 120 comprises a fluid reservoir 121, amanifold flow control 122, an exhaust heat exchanger 123, a coolant heatexchanger 124, and one or more circulating pumps 127, all in fluidcommunication adapted to circulate the working fluid therein. Themanifold flow control 122 is adapted to direct the working fluid to themagnetic heater 9, the exhaust heat exchanger 123, and the coolant heatexchanger 124.

The heat generated by the magnetic heater 9 is transferred to theworking fluid passing within the magnetic heater 9. The working fluid iscollected in the fluid reservoir 121 and either directed again throughthe manifold flow control 122 or directed to an external heat exchanger126 by way of an external manifold 125, or a combination thereof. Theexternal manifold 125 is adapted to provide one or more fluid take-offsto supply the heated working fluid and return cooled working fluidto/from one or more external heat exchangers 126.

The engine cooling system 112 comprises a coolant reservoir 114 for acoolant fluid in fluid communication with the engine 110 and the coolantheat exchanger 124. The coolant fluid circulates within the engine 110,wherein the heat from the structure of the engine 110 is transferred tothe coolant fluid and subsequently transferred to the working fluid inthe coolant heat exchanger 124. In this way, the heat from the engine110 as well as the heat from the magnetic heater 9 is used to heat theworking fluid.

The engine 110 produces hot exhaust gas as a product of combustion whichis directed external to the engine 110 by an exhaust manifold 128. Theexhaust system 129 comprises the exhaust heat exchanger 123 which is influid communication with the exhaust manifold 128 and is adapted totransfer the heat from the exhaust of the engine 110 to the workingfluid. In this way, the heat from the exhaust as well as the heat fromthe magnetic heater 9 is used to heat the working fluid.

The engine-driven heat generation system 100, therefore, utilizes theheat of the structure and the heat from the exhaust of the engine 110 toaugment the heat from the magnetic heater 9 to efficiently provide aheated working fluid for use in external applications.

It is appreciated that a variety of configurations of an engine-drivenheat generation system may be utilized, depending on engineering designpreferences and constraints. FIG. 22 is a schematic diagram of anotherengine-driven heat generation system 200, in accordance with anotherembodiment of the present invention. The engine-driven heat generationsystem 200 comprises an internal combustion engine 110, a magneticheater 9, such as, but not limited to, the embodiment of FIG. 18, and afluid handling system 230. The configuration and function issubstantially similar to the embodiment of FIG. 21, but this embodimentcomprises an engine 110 having two exhaust manifolds 128 a, 128 b, twoexhaust heat exchangers 123 a, 123 b in fluid communication withrespective exhaust manifolds 128 a, 128 b, and separate externalmanifolds, a supply manifold 125 a and a return manifold 125 b.

The applications for utilizing the heat generated by the engine-drivenheat generation system 100, 200 are vast. The working fluid is heated toa predetermined temperature suitable for a particular purpose. It isanticipated that most any application that utilizes the transfer of heatvia a heat exchanger supplied by a heated working fluid would besuitable for use with the engine-driven heat generation system 100, 200.

In an embodiment in accordance with the present invention, the heatedworking fluid is passed through a heat exchanger that is part of aforced-air ventilation system to provide heated air to a building. Inanother embodiment, the working fluid is passed through hoses that arelaid out on the ground and covered with a covering so as to heat theground, such as to thaw out frozen ground for excavation. In yet anotherapplication, the working fluid is passed through a heat exchanger of ahot water supply system that is submerged in a tank of water so as toheat the water for use. These are but a few of the vast number ofapplications suitable for use with the engine-driven heat generationsystem 100, 200.

The engine-driven heat generation system 100, 200 realizes significantlyimproved efficiencies over conventional magnetic heaters by theutilization of the heat captured from the engine exhaust and the heatcaptured from the engine cooling system that are added to the heatgenerated by the magnetic heater.

Although specific embodiments have been illustrated and described hereinfor purposes of description of the preferred embodiment, it will beappreciated by those of ordinary skill in the art that a wide variety ofalternate and/or equivalent implementations calculated to achieve thesame purposes may be substituted for the specific embodiments shown anddescribed without departing from the scope of the present invention.Those with skill in the art will readily appreciate that the presentinvention may be implemented in a very wide variety of embodiments. Thisapplication is intended to cover any adaptations or variations of theembodiments discussed herein.

Persons skilled in the art will recognize that many modifications andvariations are possible in the details, materials, and arrangements ofthe parts and actions which have been described and illustrated in orderto explain the nature of this invention and that such modifications andvariations do not depart from the spirit and scope of the teachings andappended claims contained.

1-11. (canceled)
 12. An engine-driven heat generation system comprising:an internal combustion engine having a drive shaft, an exhaust system,and a cooling system; a magnetic heater comprising at least oneconductor assembly and at least one magnet assembly in closely-spaced,opposing, alternating configuration with the at least one conductorassemblies assembly, the at least one conductor assembly at least inpart defining a fluid path, the at least one conductor assembly and atleast one magnet assembly aligned along an axis defined by the driveshaft, the conductor assembly comprising an electrically conductivematerial such that eddy-currents are induced within the conductorassembly when exposed to a time-varying magnetic flux, each magnetassembly operably coupled to the drive shaft such that the at least onemagnet assembly rotates relative to the at least one conductor assemblywhen the drive shaft is rotated so as to induce eddy currents in the atleast one conductor assembly which heats the at least one conductorassembly and in turn heats a working fluid within the fluid path; and afluid handling system comprising: a manifold flow control operable todirect the working fluid to the fluid path; an exhaust heat exchangeroperably coupled to the exhaust system of the engine and operablycoupled to the manifold flow control such that heat from the exhaustsystem is transferred to the working fluid; and a coolant heat exchangeroperably coupled to the cooling system of the engine and operablycoupled to the manifold flow control such that heat from the coolingsystem is transferred to the working fluid.
 13. The heat generationsystem of claim 12, the magnet assembly comprising a plurality ofmagnets, wherein the at least one magnet assembly is adapted to disposethe magnets in close proximity to the at least one conductor assembly.14. The heat generation system of claim 12, wherein the magnetic heatercomprises: a first, second and third conductor assembly in alternatingarrangement with a first, second, third, and fourth magnet assembly, theconductor assemblies and magnet assemblies in axial alignment with thedrive shaft, the conductor assemblies and magnet assemblies spaced aparta predetermined distance.
 15. The heat generation system of claim 12,wherein the at least one magnet assembly comprises: a magnet plate inthe form of a substantially circular disk, a plurality of magnet pocketsdisposed on a side of the magnet plate and at a predetermined distanceadjacent a magnet plate peripheral edge, the plurality of magnet pocketsadapted to at least partially receive at least one magnet therein; atleast one magnet at least partially disposed within each magnet pocket;and at least one retainer plate coupled to the magnet plate capturingthe magnet within the magnet pocket.
 16. The heat generation system ofclaim 15, wherein the retainer plates comprise a plurality of fastenerapertures adapted to receive suitable fasteners there through, thefastener apertures adapted to align with threaded bores disposed in themagnet plate.
 17. The heat generation system of claim 15, wherein theretainer plate comprises a plurality of retainer pockets complementarywith the magnet pockets and adapted to receive at least a portion of atleast one magnet therein.
 18. The heat generation system of claim 15,wherein the magnet pockets are adapted to receive the magnet entirelytherein, and the retainer plate comprises a substantially flat surfaceto contain the magnet therein.
 19. The heat generation system of claim15, wherein the retainer pockets are adapted to receive the magnetentirely therein, and the magnet plate comprises a substantially flatsurface to contain the magnet therein.
 20. The heat generation system ofclaim 13, wherein the magnet plates further comprise a central shaftaperture adapted to accept the drive shaft therethrough.
 21. The heatgeneration system of claim 12, the at least one conductor assemblycomprising a pair of conductor plates retained about a peripheral edgein fluid-tight engagement by a frame, the conductor plates comprise anelectrically conductive material adapted to enable induced eddy-currentswithin the conductor plate when exposed to a time-varying magnetic flux,the frame adapted to retain the conductor plates in facing spaced-apartrelationship a predetermined distance apart defining a fluid spacetherebetween which in-part defines the fluid path, the frame adapted toseal the peripheral edge of the conductive plates defining the fluidspace, the conductor plates each have a bushing aperture adapted toreceive the bushing therein, a bushing seal about the bushing apertureadapted to engage the conductor plates about the bushing aperture andthe bushing is operable to maintain fluid-tight engagement therebetweenso as to define the fluid space.
 22. The magnetic heater of claim 21,the at least one conductor assembly further comprising a fluid inlet anda fluid outlet defining at least a portion of the fluid path, the fluidspace operable such that the working fluid may be passed between thefluid inlet and the fluid outlet sufficient to provide heat transferfrom the conductor plates to the working fluid as the conductor platesare heated during operation. 23-24. (canceled)
 25. The magnetic heaterof claim 12, wherein the working fluid is a liquid.
 26. The magneticheater of claim 12, the fluid handling system further comprising: afluid reservoir operably coupled to the fluid path wherein the workingfluid is recollected in the fluid reservoir and either directed againthrough the manifold flow control or directed to an external heatexchanger by way of an external manifold, the external manifold operableto provide fluid take-offs operable to supply the working fluid to theexternal heat exchanger and return the working fluid to the fluidreservoir.
 27. An engine-driven heat generation system comprising: aninternal combustion engine having a drive shaft, an exhaust system, anda cooling system; a magnetic heater comprising at least one conductorassembly and at least one magnet assembly in closely-spaced, opposing,alternating configuration with the at least one conductor assembly, theat least one conductor assembly at least in part defining a fluid path,the conductor assembly comprising an electrically conductive materialsuch that eddy-currents are induced within the conductor assembly whenexposed to a time-varying magnetic flux, each magnet assembly operablycoupled to the drive shaft such that the at least one magnet assemblymoves relative to the at least one conductor assembly when the driveshaft is rotated so as to induce eddy currents in the at least oneconductor assembly which heats the at least one conductor assembly andin turn heats a working fluid within the fluid path; and a fluidhandling system comprising: a fluid reservoir; a manifold flow controloperable to direct the working fluid to the fluid path; an exhaust heatexchanger operably coupled to the exhaust system of the engine andoperably coupled to the manifold flow control such that heat from theexhaust system is transferred to the working fluid; and a coolant heatexchanger operably coupled to the cooling system of the engine andoperably coupled to the manifold flow control such that heat from thecooling system is transferred to the working fluid, the fluid reservoiroperably coupled to the fluid path wherein the working fluid isrecollected in the fluid reservoir and either directed again through themanifold flow control or directed to an external heat exchanger by wayof an external manifold, the external manifold operable to provide fluidtake-offs operable to supply the working fluid to the external heatexchanger and return the working fluid to the fluid reservoir.
 28. Theheat generation system of claim 27, the magnet assembly comprising aplurality of magnets, wherein the at least one magnet assembly isadapted to dispose the magnets in close proximity to the at least oneconductor assembly.
 29. The heat generation system of claim 27, whereinthe magnetic heater comprises: a first, second and third conductorassembly in alternating arrangement with a first, second, third, andfourth magnet assembly, the conductor assemblies and magnet assembliesin axial alignment with the drive shaft, the conductor assemblies andmagnet assemblies spaced apart a predetermined distance.
 30. The heatgeneration system of claim 28, wherein the magnet plates furthercomprise a central shaft aperture adapted to accept the drive shafttherethrough.
 31. The heat generation system of claim 30, the at leastone conductor assembly comprising a pair of conductor plates retainedabout a peripheral edge in fluid-tight engagement by a frame, theconductor plates comprise an electrically conductive material adapted toenable induced eddy-currents within the conductor plate when exposed toa time-varying magnetic flux, the frame adapted to retain the conductorplates in facing spaced-apart relationship a predetermined distanceapart defining a fluid space therebetween which in-part defines thefluid path, the frame adapted to seal the peripheral edge of theconductive plates defining the fluid space, the conductor plates eachhave a bushing aperture adapted to receive the bushing therein, abushing seal about the bushing aperture adapted to engage the conductorplates about the bushing aperture and the bushing is operable tomaintain fluid-tight engagement therebetween so as to define the fluidspace.
 32. The magnetic heater of claim 31, the at least one conductorassembly further comprising a fluid inlet and a fluid outlet defining atleast a portion of the fluid path, the at least one conductor assemblyadapted to provide a fluid passage within the fluid space defining atleast a portion of the fluid path, the fluid space operable such thatthe working fluid may be passed between the fluid inlet and the fluidoutlet sufficient to provide heat transfer from the conductor plates tothe working fluid as the conductor plates are heated during operation.33. An engine-driven heat generation system comprising: an internalcombustion engine having a drive shaft, an exhaust system, and a coolingsystem; a fluid handling system; a magnetic heater comprising: one ormore conductor assemblies at least in part defining a fluid path, eachconductor assembly comprising a pair of conductor plates defining afluid space therebetween, the fluid space in fluid communication with afluid inlet and a fluid outlet adapted to restrict the flow of a workingfluid from the fluid inlet, through the fluid space, and out of thefluid outlet defining at least in part the fluid path, the conductorplates comprise an electrically conductive material operable to enableinduced eddy-currents within the conductor plates when exposed to atime-varying magnetic flux; and one or more magnet assemblies comprisingone or more magnets, each magnet assembly in opposing, facingarrangement spaced apart a predetermined distance from a respectiveconductor assembly, wherein the magnet assembly is adapted to disposethe one or more magnets in close proximity to at least one conductorplate, each magnet assembly coupled to the drive shaft operable suchthat the magnet assembly moves relative to at least one conductor platewhen the drive shaft is caused to rotate, wherein the magnet assembly isadapted to induce eddy currents in the at least one conductor plate whenmoved relative thereto, wherein the fluid space is operable to provideheat transfer from the conductor plates to the working fluid as theconductor plates are heated during operation, the fluid handling systemcomprising: a fluid reservoir; a manifold flow control operable todirect the working fluid to the fluid path; an exhaust heat exchangeroperably coupled to the exhaust system of the engine and operablycoupled to the manifold flow control such that heat from the exhaustsystem is transferred to the working fluid; and a coolant heat exchangeroperably coupled to the cooling system of the engine and operablycoupled to the manifold flow control such that heat from the coolingsystem is transferred to the working fluid, the fluid reservoir operablycoupled to the fluid path wherein the working fluid is recollected inthe fluid reservoir and either directed again through the manifold flowcontrol or directed to an external heat exchanger by way of an externalmanifold, the external manifold operable to provide fluid take-offsoperable to supply the working fluid to the external heat exchanger andreturn the working fluid to the fluid reservoir.